Improvement in watohmaeees  tools



' T0 ALL WOM IT MAY CONOERN:

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JOHN M. GAYGE, or ERAN-KEIN, TENNESSEE.

.Letters Patent No. 70,074, dated. omteiae, 1867.

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Be it known that I, JOIINM. CAYCE, of Franklin, in the county of Williamson, and State of Tennessee,

have invented a new and improved Watchmakers Tool; and I do hereby declare the following' to be a full,.

clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, and in which- Y `-Figure l shows the edge of my instrument in elevation.

Figure is a sideelevation of" my invention.

Figure 3 is an end view of the same.

Similar letters of reference indicate corresponding parts in the several gures.

This instrument is designed for rectifying and reshaping the. cogs of watch-wheels, in order to make the gearing run better, and for other purposes. Y

In many newl watches the cogs of the Wheels are of irregular shapes, the spaces between them being very uneven, both in width and depth, from which cause the watch runs irregularly, and often thc gearing becomes so badly ont of order that the watch stops. The Work of resetting or reshaping these cogs so to adjust properly the width 4and depth ofthespaces between them, and make them gear accurately with their companion Wheels, is one of extreme diiiiculty, requiring exceeding great care, and consuming a great deal of time. In

pose, some using saws, sor-ne files, some swaging down'the sides of the cogs so as to elongate them, and others, as. above described,` being obliged to reset the Whole wheel. I claim` to have provided thc craft, in this invention, withaninstru-tnent by which such cogs canbeperfectly remodelled and adjusted without diliculty in less of such edges being opposite to each-other. By this shape the blades may be inserted at their thin or narrow? end, between the finest cogs, and where coarse or heaviercogs are used the thick stout end of the blades may -be used. The design o f the-instrument is to grasp the cog between these blades just as a person would grasp anything with a pair of pliers, and holding it in this position, to press the oog into the shape required. In most instances the cogs require to be elongated. This can be donc almost instantly by such an instrument as mine, the working faces of the cogs being preserved smooth and regular by the process. If the cog isnot only flattened and elongated, but also widened by the pressure, it may be i'lled down to the proper width. Cogs` of diilerent sizes may be operatedupomns above explained, at diilerent points upon the blades a a so that the thinness of the blades may beproportioned to the ineness of Ithe cogs. Delicate cogs with very minute intera vals between them could not bc grasped, -perhaps, at'the thick `end of the blades, for the reason that the blade could .not at that point be inserted between the1n,while, on the other hand, the delivery of the blades at their` opposite end is too great to admit of their being applied at that point to large cogs. If the instrument Werl left'simply as above described, however, it would answer buthalf the required purpose. It would press the eogs, elongating them and enlarging the spaces between them, but with no regularity ofaction. Thevlast state of the cogs would, perhaps, be worse than the first. To insure perfect regularity of action and etl'ect, I attach iirst the guide B, which slides alongv the blades a a, and is adjustable by means of slot and set-screwl It will now be only necessary to determine the point upon the blades'a a at which you wish to apply Vthem to the coge, and set the guide B at that point. Then insert the instrument so that the guide shall bear against the side of the cog, and at once you insure perfect uniformity inthe application ot' thc instrument to its work. The cogs may'sti-ll, however, be elongated too much or too little. To obviate this I have provided the gauge-screw C, running laterally through one jaw of the ,instrumenta and acting against the other jau. NOW determine the `precise e'eet you wish to produce upon the imperfect cog, and set the gauge-screw C so as to produce that effect.

- The instrument will not only now be applied at the same point to every cog upon the wheel, but it is so gauged as to produce precisely'the same etfect'upon every cog, rendering them all of perfectly uniform thickness. The slot b in the guide B is intended to receive the shaft of the wheel while the watchmaker is operating upon the oog. A moment or two will enable -the operator to determine the points at which to set the guide and the gauge, and when this is done the rest of the work is simple and easily performed, requiring but little time, and calling for but linie skin.

In the old method of resetting these cogs, the edges are strained excessively, the most delicate touch being required at every period of the operation. In my instrument, however, the guide and gauge take the place of eyes to a great extent, after they have once been properly adjusted, and render it as diicult to produce the wrong effect as it is by the old-fashioned method to produce the right one, My instrument has been4 tested thoroughly in the watchmakers shop, and is found to be perfectly adapted to' the purpose for which it was invented. Y

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is The instrument above described, having the blades a a, the guide B, and the gauge-screw C, substantially as and for the purpose specified.

To the above specification of my improvement I have signed my hand this 24th'day of May, 1867.

` JOHN' M. CAYGE.

Witnesses:

CEAS. A. Pnrrtr, SoLoN O. KnMoN. 

